<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>lesson 18</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>

<body>
    <div id="root"></div>
</body>

</html>
<script>
    const app = Vue.createApp({
        data() {
            return {
                count: 1
            };
        },
        methods: {
            handleAddOne() {
                this.count += 1;
            }
        },
        template: `
            <div>
                <counter :count="count" @add-one="handleAddOne">    
            </div>
        `
    });
    app.component('counter', {
        props: ["count"],
        methods: {
            handleItemClick() {
                this.$emit('addOne');
            }
        },
        template: `<div @click="handleItemClick">{{count}}</div>`
    })
    const vm = app.mount("#root")
</script>